After performing a TPI to carb swap is the fuel delivery circuit supposed to work as it did before the swap?

All the components are still there. Oil pressure sensor, Fp relay, ECM etc.

My issue is that the FP does initialize when I key on. The car starts and runs dies shortly because the fuel pump does not come back on. I understand that normally the Oil pressure sending unit would signal the circuit to come on and power the FP, but this is not happening.

I want to make sure that this sould happen after a swap before I go out and spend money on a Oil pressure sensor. Rather then hot hiring the FP relay if that is required.

 

I'm certainly no guru on this, having the old stuff only. From what I've gathered, though, the circuit that keeps the pump running goes through the ECM. But, most people report the pump functions properly when doing the swap, so I'm not sure what to tell you.

If the timed relay at ignition-on is working, and you don't have run power to the pump, a simple solution would be to provide switched power to the oil pressure switch circuit and be done with it.

 

I've had no experience in this area myself since i'm a tpi lover, but a few of my friends have. I don't know how they got their pump to work but the pump didn't do them any good. You'll have to go ahead and buy or find a mechanical fuel pump that mounts to the engine and hook up the fuel line to that. For some reason the stock electric pump won't feed the carberator the amount of fuel it needs at WOT and will starve the engine. I know that some people have kept the stock pump in the tank and ran the mechanical pump without problems but most remove the pump and put a rubber hose to the bottom of the tank.

 

See the sticky at the top of the forum on converting an in-tank electric pump to a pickup with the sock screen. The only way to go about it, IMHO (vs. a simple piece of rubber hose) if you're removing the pump.

If I had an in-tank electric pump, I'd keep it since that is the #1 insurance against vapor lock. Upgrade in-tank pumps are available that will feed any streetable power dreams you might have.

 

Same thing happened to me.

Heres what you do.

Find your fuel pump relay, and cut the green/white wire. Run that wire from the relay down to your fuse panel to where your 'fuel injector' fuse used to go (you can take the injector fuses out as you dont have injectors anymore). Not sure which terminal on the fuse is supply, try both.

Now, when you turn the key, you will hear the pump run constantly.

 

I just finished my tbi to carb swap and like some lucky people on here, my fuel pump would still run even with the ecm out... but after i pulled out the harness it wouldnt work... all i did is find the fuel pump relay, i found the wire that runs the pump and ran an accessory wire to it... havent had any problems yet

 

This is kind of old but I was reading and thought if this: The carb has fuel left in the bowls when you shut the car off, that is its reserve.

On a fuel injected car, if the fuel pump relay goes out, the car will keep the pump running as long as the car has oil pressure. If the FP Relay is bad on a TPI/TBI car, it will take a lot of cranking time to get oil pressure up and kick the pump on. This means a lot of cranking to start the car because fuel isn't supplied instantly.

On a Carb, the car can use the fuel in the bowls to start and by the time you get it into gear oil pressure will be up and the electric pump will be running supplying pressure.

If your oil pressure switch is bad, then the pump won't run at all. You may want to check that switch.

 

Back in 03 when i converted my 305tbi to carb i wondered aboiut the fuel pump issue and found a simple idea that makes it to where you dont have to crawl under the car...get a repair manual from the auto parts store (if you have already) and look for fuel pump test like the aldl test with a paper clip there is also a simple two wire touch that turns the fuel pump on....look in the manual find out which wires it is i dont remember and im in afghan right now so i cant look at my RS to tell you.... once you cut and crimp those two wires together your fuel issue is done...plus easier way to see if your fuel pump is a done for